code: def _create_trajectory(self):
      return trajectory.Trajectory(
          observation=(),
          action=(tf.constant(1)),
          policy_info=(),
          reward=tf.constant(1.0),
          discount=tf.constant(1.0),
          step_type=ts.StepType.FIRST,
          next_step_type=ts.StepType.LAST,
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  import tensorflow
  from tf_agents.bandits.metrics import tf_metrics
  from tf_agents.bandits.policies import constraints
  from tf_agents.specs import tensor_spec
  from tf_agents.trajectories import time_step
  from tf_agents.trajectories import trajectory
label_desc: Use image node_id 1 for calling the TFMetricsTest obj's underlying member method code with example usage: obj._create_trajectory() and returns: trajectory